Lexmark E250D Service Manual - Page 70

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4512-220, -230 Print quality service checks Note: Ensure the cover closes tightly. A gap in the opening may allow light to expose the photoconductor resulting in a 'dirty' print. Extreme environmental conditions, temperatures, and humidity will affect the print quality. Using print quality test pages To help isolate print quality problems, like streaking, print test pages using the print quality test pages. To print the print quality test pages: 1. Enter Configuration Menu. a. Turn off the printer. b. Open the front access cover. c. Turn on the printer while pressing and holding . d. When light stays on, close cover. e. Wait (approximately 10 seconds). 2. Press and release three times until the and lights come on. 3. Press and hold until all the lights flash to initiate printing the quality test pages. Four pages print to help evaluate print quality. The first page has various fonts and a graphic, the second page is gray with graphics, the third page is black, and the last page is blank. Once the media exits into the output bin, the printer returns to the home state (four top lights on). 4. Use the test pages to isolate problems such as light or toner streaks. See "POST symptom table" on page 2-37 for solutions to these problems. To exit print quality test pages, turn the printer off. Note: Refer to the print defects guide at the end of the manual for repeating defects. Blank page FRU Toner cartridge (not a FRU) Printhead LVPS/HVPS Controller card Action Remove the toner cartridge, and gently shake it to evenly distribute the toner. Check for cartridge damage. Blank pages can be caused by a defective printhead assembly, LVPS/HVPS, or controller card. • Printhead errors typically result in printer service errors unless there is blockage of the beam or dust on the lens. • Blank pages typically are caused by the PC roll not being properly charged. Try a different PC kit. Unplug the printer, and check the cable continuity between the LVPS/HVPS connector marked OPC (at PCN 2) and the corresponding wire form (spring) found about 14 mm above and to the right of the transfer roll gear. • If there is not continuity, call the next level of service. Try a different toner cartridge and PC kit. • If those fail, replace the LVPS/HVPS, controller card, or the printhead in that order. Also, see "Solving print quality problems" on page 3-50. 2-46 Lexmark™ E250d and E250dn

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2-46
Lexmark™ E250d and E250dn
4512-220, -230
Print quality service checks
Note:
Ensure the cover closes tightly. A gap in the opening may allow light to expose the photoconductor
resulting in a ‘dirty’ print. Extreme environmental conditions, temperatures, and humidity will affect the print
quality.
Using print quality test pages
To help isolate print quality problems, like streaking, print test pages using the print quality test pages. To print
the print quality test pages:
1.
Enter Configuration Menu.
a.
Turn off the printer.
b.
Open the front access cover.
c.
Turn on the printer while pressing and holding
.
d.
When
light stays on, close cover.
e.
Wait (approximately 10 seconds).
2.
Press and release
three times until the
and
lights come on.
3.
Press and hold
until all the lights flash to initiate printing the quality test pages.
Four pages print to help evaluate print quality. The first page has various fonts and a graphic, the second
page is gray with graphics, the third page is black, and the last page is blank. Once the media exits into the
output bin, the printer returns to the home
state (four top lights on).
4.
Use the test pages to isolate problems such as light or toner streaks. See
“POST symptom table” on
page 2-37
for solutions to these problems.
To exit print quality test pages, turn the printer off.
Note:
Refer to the print defects guide at the end of the manual for repeating defects.
Blank page
FRU
Action
Toner cartridge (not a
FRU)
Remove the toner cartridge, and gently shake it to evenly distribute the toner.
Check for cartridge damage.
Printhead
LVPS/HVPS
Controller card
Blank pages can be caused by a defective printhead assembly,
LVPS/HVPS, or controller card.
•
Printhead errors typically result in printer service errors unless there is blockage of the
beam or dust on the lens.
•
Blank pages typically are caused by the PC roll not being properly charged. Try a
different PC kit.
Unplug the printer, and check the cable continuity between the LVPS/HVPS connector
marked OPC (at PCN 2) and the corresponding wire form (spring) found about 14 mm
above and to the right of the transfer roll gear.
•
If there is not continuity, call the next level of service.
Try a different toner cartridge and PC kit.
•
If those fail, replace the LVPS/HVPS, controller card, or the printhead in that order.
Also, see
“Solving print quality problems” on page 3-50
.